It would depend on the point of the print. Not if it was paid for or free.
If the transaction was a sale. Weather actually paid or a freeby to a friend, then I would not sign or watermark it. But if it is to be hung somewhere as a promotional piece... Dr office, coffeeshop...etc...etc. Then I would have a noticeable watermark in one of the corners.
I suppose everyone has their own thoughts and views about this. I've only done prints for myself, so I have no real world experience doing it for clients, but I would think that I would want to have my name on everything I took, unless specifically requested by the client. Say it was something I took and gave to a friend (free or not) and they display it in their house.... When they have friends over, they would see that AWESOME PICTURE with my name/logo, which I would think would lead to more referrals. No one else could take credit for that image.
This takes me back to seeing the Olan Mills logo on prints ... it was definitely there on every print. Why not take credit for your work... it's gotta be better than Olan Mills, right?
This is to say, that it doesnt have to be a 100% opacity marking either, it can be toned down, so it doesnt take away from the image.


